public void TestCreateAndRetrieve()
        {
            var info = _client.CreateCustomsInfo(new CustomsInfo {
                CustomsCertify = true,
                EelPfc         = "NOEEI 30.37(a)",
                CustomsItems   = new List <CustomsItem> {
                    new CustomsItem {
                        Description   = "TShirt",
                        Quantity      = 1,
                        Weight        = 8,
                        OriginCountry = "US",
                    },
                },
            }).Result;

            var retrieved = _client.GetCustomsInfo(info.Id).Result;

            Assert.AreEqual(info.Id, retrieved.Id);
            Assert.IsNotNull(retrieved.CustomsItems);
        }